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PDF 23LC1RB-TB Data sheet ( Hoja de datos )
| Número de pieza | 23LC1RB-TB | |
| Descripción | LCD TV SERVICE MANUAL | |
| Fabricantes | LG | |
| Logotipo |  |
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e-mail:http://www.LGEservice.com/techsup.html
LCD TV
SERVICE MANUAL
CHASSIS : ML-041G
MODEL : 23LC1RB-TB
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
1 page  
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
-5-
5 Page 
ADJUSTMENT INSTRUCTION
1. Application Object
This document is applied to 23" Wide LCD TV which is
manufactured in Monitor Factory or is produced on the basis
of this data.
2. Designation
2.1. The adjustment is according to the order which is
designated and which must be followed, according to the
plan which can be changed only on agreeing.
2.2. Power Adjustment: Free Voltage
2.3. Magnetic Field Condition: Nil.
2.4. Input signal Unit: Product Specification Standard
2.5. Reserve after operation: Above 30 Minutes
2.6. Adjustment equipments: Pattern Generator (801GF,
MSPG925F), DDC Adjustment Jig equipment
3. Adjustment
3.1 Auto Gain/Offset Adjustment
3.1.1 PC Mode Adjustment
3.1.1.1 Adjustment preparation
Execution of RF no signal during Heat Run over 30min
15 Pin D-Sub Jack of LCD TV is connected to the
signal of Pattern Generator.(MSPG-925 serise)
3.1.1.2 Auto Gain/Offset Adjustment
Convert to PC Mode in Input-Mode
Select MODEL: 37(1024x768) in Pattern Generator
Select PATTERN:12(16 Step Gray signal) in Pattern
Generator (MSPG-925 SERISE)
Press IN-START Key by using the Remote
Controller(SVC), after converting to Adjustment-Mode,
press VOL+ Key consecutively in AutoGain Menu.
After adjustment is complete, pressing enter key,
stores and completes the process
No Item
1. White Balance,
X axis
2. White Balance,
Y axis
3. White Balance,
X axis
4. White Balance,
Y axis
Min Typ Max Unit Remark
0.272 0.287 0.302 MB/TB ±0.015(95% white
Video or comp1 mode)
0.274 0.289 0.304 MB/TB ±0.015 (95%white
Video or comp1 mode)
0.268 0.283 0.298 ZB ±0.015 (95%white
AV1 or comp mode)
0.283 0.298 0.313 ZB ±0.015 (95%white
AV1 or comp mode)
3.2 EDID (The Extended Display Identification
Data) Adjustment
Connect 15 Pin D-Sub Cable to D-Sub Jack
Set up the input mode of the SET to PC
For the DDC connect an automation equipment and data
is written on DDC.
(Refer to Working Order for relative setting up)
3.2.1 EDID DATA
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00 00 FF FF FF FF FF FF 00 1E 6D 17 56 01 01 01 01
10 00 0F 01 03 01 40 26 78 08 B1 DA A1 56 48 98 24
20 13 48 4B A1 08 00 31 40 01 01 01 01 45 40 01 01
30 61 40 81 80 01 01 4E 1F 00 90 51 00 1B 30 40 88
40 13 00 A2 0B 32 00 00 18 1B 21 50 A0 51 00 1E 30
50 48 88 35 00 A2 0B 32 00 00 1C 00 00 00 FD 00 3B
60 3D 1F 30 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 32 33 4C 43 31 52 20 20 20 20 20 20 20 00 7B
3.2.2 Component Mode Adjustment
3.2.2.1 Adjustment Preparation
Execution of RF no signal during Heat Run over 30min
The component jack(Y,Pb,Pr) of LCD TV is connected
to Y, Pb, Pr Output Signal of Pattern Generator
(MSPG-925 SERISE)
3.2.2.2 Auto Gain/Offset Adjustment
Convert to Component Mode in Input-Mode.
Select MODEL: 228(480p Mode, Y : 100%, Pb/Pr :
75%) in Pattern Generator
Select PATTERN : 33 (Color Bar Pattern signal) in
Pattern Generator (MSPG-925 SERISE)
Press IN-START Key by using the Remote
Controller(SVC) , after converting to Adjustment-Mode,
press VOL+ Key consecutively in AutoGain Menu.
After adjustment is complete, pressing enter key,
stores and completes the process
- 11 -
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet 23LC1RB-TB.PDF ] | |
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